I am going with Kooks 1 7/8 and Kooks Green Cats. No tune is required on this and many of the SS guys have had no CEL come on because you are keeping your O2 sensors in place. I am going to do a stock dyno then a dyno with the headers and cats with stock exhaust here in the next few weeks. I am NOT going to tune.

I am going with Kooks 1 7/8 and Kooks Green Cats. No tune is required on this and many of the SS guys have had no CEL come on because you are keeping your O2 sensors in place. I am going to do a stock dyno then a dyno with the headers and cats with stock exhaust here in the next few weeks. I am NOT going to tune.

I also am looking for exhaust "no tune" options. Has anyone installed the solo cats on a ZL1? If so what are the hp and sound improvements.?

I'm also interested in the Kooks headers when green cats option. I saw on another thread a comment that this option might cause the engine to run lean with the factory tune at WOT. If true, this option would not work for me since I attend open track days quite often.

I appreciate any information or insight anyone might have on either of these options.

I also am looking for exhaust "no tune" options. Has anyone installed the solo cats on a ZL1? If so what are the hp and sound improvements.?

I'm also interested in the Kooks headers when green cats option. I saw on another thread a comment that this option might cause the engine to run lean with the factory tune at WOT. If true, this option would not work for me since I attend open track days quite often.

I appreciate any information or insight anyone might have on either of these options.

I don't understand how the car would run lean. The MAF should be able to compensate for these changes.

The green cats are way too expensive. If you're making 650rwhp+ get cheap cats because you're gonna keep blowing them out anyway. Paying $1500 once a year for cats isn't economically wise when you can pick up a set of cheap cats for $250. If you're under 650rwhp and just like to spend money then buy them.

The green cats are way too expensive. If you're making 650rwhp+ get cheap cats because you're gonna keep blowing them out anyway. Paying $1500 once a year for cats isn't economically wise when you can pick up a set of cheap cats for $250. If you're under 650rwhp and just like to spend money then buy them.

The only reason I want the green cats and long tubes is because I'm not going to modify the car to the extreme. Why would these cats blow out? The same thing should happen to oem cats if this is true?

All cats will blow out. When you start making 650rwhp+ you will eventually blow the cats. This is why almost everyone running this power level or higher gets rid of the cats. What happens is they begin melting and the guts end up giving way. They can even plug off and cause engine damage.

All cats will blow out. When you start making 650rwhp+ you will eventually blow the cats. This is why almost everyone running this power level or higher gets rid of the cats. What happens is they begin melting and the guts end up giving way. They can even plug off and cause engine damage.

So you are saying green cats and headers are going to blow out even keeping the car stock with no tune. I'm only doing headers, rotofab intake, and kooks green cats.

Hi SlingShot..Was thinking about installing some Solo's and noweeds on my ZL1.
Are you happy with the sound? Saw your video..sounds good
Would you say the sound produced is similar to headers on the Z?
Anymore vids or sound clips?